Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

VaporCliquid equilibria (VLE) have been measured for methanol, ethanol, 2-propanol, acetone, tetrahydrofuran (THF) and water with the ionic liquids 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [EMIM][(CF3SO2)2N], 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [BMIM][(CF3SO2)2N], 1-methyl-3-methyl-imidazolium dimethylphosphate [MMIM][(CH3)2PO4] at 353.15K with the help of a computer-driven static apparatus. Forwater a miscibility gapwas observed with [EMIM][(CF3SO2)2N] and [BMIM][(CF3SO2)2N] at 353.15 K, for the oxygenated compounds (acetone, alcohols and THF) homogeneous behavior was obtained. While for THF positive deviation from Raoult!-s law was observed, very small activity coefficients at infinite dilution |A!Pi were observed for water and alcohols with [MMIM][(CH3)2PO4]. The experimental VLE data were correlated using the UNIQUAC model. The relative mean deviations between the measured and predicted pressures obtained using the UNIQUAC model are 4.7%.